Messages in this thread | | | Date | Mon, 27 Mar 2023 15:10:25 +0200 | From | Andrew Jones <> | Subject | Re: [PATCH v7 4/4] RISC-V: Add arch functions to support hibernation/suspend-to-disk |
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On Thu, Mar 23, 2023 at 12:56:04PM +0800, Sia Jee Heng wrote: > Low level Arch functions were created to support hibernation. > swsusp_arch_suspend() relies code from __cpu_suspend_enter() to write > cpu state onto the stack, then calling swsusp_save() to save the memory > image. > > Arch specific hibernation header is implemented and is utilized by the > arch_hibernation_header_restore() and arch_hibernation_header_save() > functions. The arch specific hibernation header consists of satp, hartid, > and the cpu_resume address. The kernel built version is also need to be > saved into the hibernation image header to making sure only the same > kernel is restore when resume. > > swsusp_arch_resume() creates a temporary page table that covering only > the linear map. It copies the restore code to a 'safe' page, then start > to restore the memory image. Once completed, it restores the original > kernel's page table. It then calls into __hibernate_cpu_resume() > to restore the CPU context. Finally, it follows the normal hibernation > path back to the hibernation core. > > To enable hibernation/suspend to disk into RISCV, the below config > need to be enabled: > - CONFIG_ARCH_HIBERNATION_HEADER > - CONFIG_ARCH_HIBERNATION_POSSIBLE > > Signed-off-by: Sia Jee Heng <jeeheng.sia@starfivetech.com> > Reviewed-by: Ley Foon Tan <leyfoon.tan@starfivetech.com> > Reviewed-by: Mason Huo <mason.huo@starfivetech.com> > Reviewed-by: Conor Dooley <conor.dooley@microchip.com> > --- > arch/riscv/Kconfig | 6 + > arch/riscv/include/asm/assembler.h | 20 ++ > arch/riscv/include/asm/suspend.h | 19 ++ > arch/riscv/kernel/Makefile | 1 + > arch/riscv/kernel/asm-offsets.c | 5 + > arch/riscv/kernel/hibernate-asm.S | 77 ++++++ > arch/riscv/kernel/hibernate.c | 427 +++++++++++++++++++++++++++++ > 7 files changed, 555 insertions(+) > create mode 100644 arch/riscv/kernel/hibernate-asm.S > create mode 100644 arch/riscv/kernel/hibernate.c >
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
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